Censored Email?

I'm not comfortable with the idea of US Postal Service deciding who can send me mail. Likewise I'm not comfortable with the idea of my email provider deciding who can send me email. AOL plans to charge bulk mailers for sending email. It sounds harmless, until you consider non-profit groups. AOL has said that non-profit groups will be exempt from charges. I see an opportunity for AOL, or one of its employees, to censor based on their personal beliefs. For instance, email from one political party may get "accidentally" blocked in the weeks before an election. I'm not saying AOL intends to use the system in that manner; I'm just pointing out that the possibility is there. I hope Gmail doesn't do the same because I would have to stop using it as my primary email address.